Affiliation:
1. Department of Zoology, University of Cambridge
Abstract
1. The paper is primarily concerned with predicting the response of the muscle (frog ilio-fibularis fast fibres) to a given stimulus under given conditions of load. The predictive value of theories based on ‘active state’ is considered in this context.
2. A method is described for measuring the speed of shortening at frequent intervals during an isotonic twitch.
3. A family of speed vs. tension curves is drawn up, each curve representing a particular time after the stimulus. These are translated into power vs. tension curves.
4. The rate of fall of mechanical power output increases linearly with time after the stimulus, but is independent of tension.
5. At the beginning of the twitch, mechanical power output increases slightly with temperature, but later in the twitch the trend is reversed, as rate of fall of power also increases with temperature.
6. The high extensibility, characteristic of resting muscle, reappears suddenly at the end of an isotonic twitch, causing a ‘break’ in the speed record. This occurs earlier at low than at high tensions.
7. The basis of predicting an isometric twitch from isotonic data, based on certain assumptions which have been made by previous authors, is explained.
8. The tension peak in an isometric twitch is reached sooner than would be predicted on these assumptions.
Publisher
The Company of Biologists
Subject
Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. Colin James Pennycuick (1933–2019);Journal of Experimental Biology;2020-05-15
2. Mechanochemical Processes;Molecules and Life;1970
3. Mechanochemical Processes;Molecules and Life;1970